CVE-2025-34520 - CVE House
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Status published High CVE-2025-34520

Arcserve UDP < 10.2 Authentication Bypass

Vulnerability Description

An authentication bypass vulnerability in Arcserve Unified Data Protection (UDP) allows unauthenticated attackers to gain unauthorized access to protected functionality or user accounts. By manipulating specific request parameters or exploiting a logic flaw, an attacker can bypass login mechanisms without valid credentials and access administrator-level features. This vulnerability affects all UDP versions prior to 10.2. UDP 10.2 includes the necessary patches and requires no action. Versions 8.0 through 10.1 are supported and require either patch application or upgrade to 10.2. Versions 7.x and earlier are unsupported or out of maintenance and must be upgraded to 10.2 to remediate the issue.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • watchTowr

Affected Vendor

Affected Software

Unified Data Protection (UDP)
Vulnerable Versions:
10.2, 8.0, 0

Timeline

Official Publish: August 27th, 2025
Last Modified: May 15th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)